I don't mean for something like a job interview where punctuality is vital, or for anything with a rigid start time. I mean just to meet someone or get somewhere in general.
When I'm meeting one friend of mine - who I do love dearly, by the way! - she insists on messaging me to let me know what time she's planning to leave, what time she HAS left and then, if she's even a couple of minutes behind schedule, will message again to say she's going to be a few minutes late; usually with added detail around the tube getting stuck behind the red signal, the escalator being broken or whatever. It makes me laugh, because if two or three minutes either way matters, she could be 30 seconds earlier by not sending the bloody messages 😁
I'm totally different. I wouldn't even notice someone being less than ten minutes late; it just feels like a normal margin of error. I certainly wouldn't message. If you're going to be 20 minutes or half an hour late then yes, tell me, but otherwise, why bother? I'm not your boss; I'm not going to make you do overtime to make up for it!